Near Canopy Arctic Acoustic Backscattering Study.
We collected under-ice backscattering data with a low frequency (400 Hz), spatially diverse, transmitting and receiving array during the ONR SIMI project in Spring '94. The experiment, termed IBEX (Ice Backscattering Experiment) was based on the idea that such arrays of sources and receivers ca...
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ftdtic:ADA327295 2023-05-15T15:07:48+02:00 Near Canopy Arctic Acoustic Backscattering Study. Ewart, Terry Henyey, Frank Olson, Leroy Williams, Kevin WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB 1994-09 text/html http://www.dtic.mil/docs/citations/ADA327295 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA327295 en eng http://www.dtic.mil/docs/citations/ADA327295 Approved for public release; distribution is unlimited. DTIC Snow Ice and Permafrost Acoustic Detection and Detectors *ACOUSTIC IMAGES *BACKSCATTERING *UNDERICE ACOUSTIC TRACKING ARRAYS ICE MECHANICS INTERFEROMETRY LOW FREQUENCY PULSE TRANSMITTERS RECEIVERS SEA ICE IBEX(ICE BACKSCATTERING EXPERIMENT) Text 1994 ftdtic 2016-02-24T09:18:50Z We collected under-ice backscattering data with a low frequency (400 Hz), spatially diverse, transmitting and receiving array during the ONR SIMI project in Spring '94. The experiment, termed IBEX (Ice Backscattering Experiment) was based on the idea that such arrays of sources and receivers can be used to make images of backscattered sound when the geometry is very well known. The data has been processed using interferometric (time delay) imaging to localize high scattering regions. The measurements were made in two locations; one directed at imaging a large ridge, the other directed at imaging an 1000 m diameter expanse of a single floe. The measurements were carried out using several pulse types. We also operated a hyperbolic noise event tracking system to locate ice-cracking events and initiate an imaging sequence. The noise levels and activity were so low during the experiment period, that this feature could not be utilized. The ridge imaging was a collaborative effort with the MIT Group under the direction of Hendrik Schmidt. We have not received the MIT data for the combined effort at this writing. Text Arctic Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Arctic |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Acoustic Detection and Detectors *ACOUSTIC IMAGES *BACKSCATTERING *UNDERICE ACOUSTIC TRACKING ARRAYS ICE MECHANICS INTERFEROMETRY LOW FREQUENCY PULSE TRANSMITTERS RECEIVERS SEA ICE IBEX(ICE BACKSCATTERING EXPERIMENT) |
spellingShingle |
Snow Ice and Permafrost Acoustic Detection and Detectors *ACOUSTIC IMAGES *BACKSCATTERING *UNDERICE ACOUSTIC TRACKING ARRAYS ICE MECHANICS INTERFEROMETRY LOW FREQUENCY PULSE TRANSMITTERS RECEIVERS SEA ICE IBEX(ICE BACKSCATTERING EXPERIMENT) Ewart, Terry Henyey, Frank Olson, Leroy Williams, Kevin Near Canopy Arctic Acoustic Backscattering Study. |
topic_facet |
Snow Ice and Permafrost Acoustic Detection and Detectors *ACOUSTIC IMAGES *BACKSCATTERING *UNDERICE ACOUSTIC TRACKING ARRAYS ICE MECHANICS INTERFEROMETRY LOW FREQUENCY PULSE TRANSMITTERS RECEIVERS SEA ICE IBEX(ICE BACKSCATTERING EXPERIMENT) |
description |
We collected under-ice backscattering data with a low frequency (400 Hz), spatially diverse, transmitting and receiving array during the ONR SIMI project in Spring '94. The experiment, termed IBEX (Ice Backscattering Experiment) was based on the idea that such arrays of sources and receivers can be used to make images of backscattered sound when the geometry is very well known. The data has been processed using interferometric (time delay) imaging to localize high scattering regions. The measurements were made in two locations; one directed at imaging a large ridge, the other directed at imaging an 1000 m diameter expanse of a single floe. The measurements were carried out using several pulse types. We also operated a hyperbolic noise event tracking system to locate ice-cracking events and initiate an imaging sequence. The noise levels and activity were so low during the experiment period, that this feature could not be utilized. The ridge imaging was a collaborative effort with the MIT Group under the direction of Hendrik Schmidt. We have not received the MIT data for the combined effort at this writing. |
author2 |
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB |
format |
Text |
author |
Ewart, Terry Henyey, Frank Olson, Leroy Williams, Kevin |
author_facet |
Ewart, Terry Henyey, Frank Olson, Leroy Williams, Kevin |
author_sort |
Ewart, Terry |
title |
Near Canopy Arctic Acoustic Backscattering Study. |
title_short |
Near Canopy Arctic Acoustic Backscattering Study. |
title_full |
Near Canopy Arctic Acoustic Backscattering Study. |
title_fullStr |
Near Canopy Arctic Acoustic Backscattering Study. |
title_full_unstemmed |
Near Canopy Arctic Acoustic Backscattering Study. |
title_sort |
near canopy arctic acoustic backscattering study. |
publishDate |
1994 |
url |
http://www.dtic.mil/docs/citations/ADA327295 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA327295 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Sea ice |
genre_facet |
Arctic Ice permafrost Sea ice |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA327295 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766339222898212864 |